If cosec𝜃+𝑐𝑜𝑡𝜃=𝑘,then prove that 𝑐𝑜𝑠𝜃=(𝑘^2−1)/(𝑘^2+1)

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If cosec𝜃+𝑐𝑜𝑡𝜃=𝑘,then prove that 𝑐𝑜𝑠𝜃=(𝑘^2−1)/(𝑘^2+1)
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